At a dinner in Nashua on Thursday night, the former Republican U.S. senator said he's keeping his options open.

"I'm not quite done with politics, but I'm not going to rule out anything right now because I haven't really thought a whole lot about it," he said.

Brown has a summer home in Rye, and if he changed his residency, he could challenge Democratic U.S. Sen. Jeanne Shaheen in 2014.

"It's always interesting when people from Massachusetts come up here and run for office," said state Democratic Party Chairman Ray Buckley. "I don't think the voters of New Hampshire are ready to elect someone who was a U.S. senator from Massachusetts just months ago to represent New Hampshire."

Brown is scheduled to appear in several New Hampshire events in the coming weeks.

"I've been asked to speak at five or six other events coming up," Brown said. "I spend time here, as I do every year, and I'm not sure what I'm going to do politically yet. I'm just recharging the batteries."

State Republican Party Chairwoman Jennifer Horn said she believes Shaheen will be vulnerable next year.

"Whether it is Scott Brown, Jeb Bradley or anyone else, I think we will see that seat switch hands," Horn said.

But Buckley said Shaheen's record as governor and senator will carry her forward.

"Her support of the bills that turned the economy around is very deeply appreciated by the people of New Hampshire," Buckley said.

Horn said she believes Shaheen's record will hurt her.

"Jeanne Shaheen has supported the policies that have led to the economic difficulties that we have faced over the last five years," Horn said.

While Buckley and Horn disagreed about Shaheen's vulnerability, both agreed that Brown's words were surprising. They gave some Republicans hope for a change in the Senate seat, while they led to the biggest ever online fundraising for state Democrats.

U.S. SENATE SEAT NOW HELD BY GENE SHAILENE. -- SHAHEEN. COULD FORMER MASSACHUSETTS SENATOR SCOTT BROWN MAKE A RUN FOR SENATE IN NEW HAMPSHIRE? AT A DINNER, HE GOT PEOPLE TALKING. I DO NOT THINK I AM DONE WITH POLITICS, BUT I AM NOT GOING TO RULE OUT ANYTHING RIGHT NOW. I HAVE NOT FOUGHT A HECK OF A LOT ABOUT IT. HE HAS A SUMMER HOME IN RYE AND IF HE CHANGED HIS RESIDENCY, HE COULD RUN IN 2014. IS ALWAYS INTERESTING WHEN PEOPLE FROM MASSACHUSETTS COME TO NEW HAMPSHIRE AND RUN FOR OFFICE HERE. I DO NOT THINK VOTERS ARE READY TO ELECT SOMEONE WHO WAS A MASSACHUSETTS SENATOR JUST A FEW MONTHS AGO TO REPRESENT NEW HAMPSHIRE. I AM GOING TO SPEND TIME HERE AS I DO EVERY YEAR. I AM JUST RECHARGING THE BATTERIES. WHETHER IT IS SCOTT BROWN OR ANYBODY ELSE, I THINK WE'RE GOING TO SEE THAT SEA CHANGE HANDS. THE REPUBLICAN PARTY CHAIR BELIEVES THE SEAT IS VULNERABLE NEXT YEAR. HER SUPPORT OF BILLS THAT TURNED THE ECONOMY AROUND ARE VERY DEEPLY APPRECIATED BY THE PEOPLE OF NEW HAMPSHIRE. HE HAS SUPPORTED POLICIES THAT HAVE LED TO ECONOMIC DIFFICULTIES OVER THE LAST COUPLE OF YEARS.

Gen. David Petraeus pleaded guilty to federal charges Tuesday to end a probe into whether he provided classified information to his mistress when he was CIA director, according to a U.S. official briefed on the matter.